20. Which of the following statements is not true?
(A) The elastic walls allow the arteries to reduce the pressure fluctuation during a cardiac cycle.
(B) The risk of stroke can be reduced by avoiding the damage to endothelium of vessels.
(C) The primary function of erythrocytes is to participate in immune reactions.
(D) Epinephrine raises blood pressure by increasing the strength and rate of the heartbeat.

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